The Gug is a colossal creature that rises to its full twenty feet, its body covered in black fur. Its mouth opens vertically rather than horizontally, running from the top to the bottom of the head and set with great yellow fangs. Each black-furred arm forks into short forearms bearing two paws apiece, and two pink eyes jut about two inches from either side of the head, shaded by bony protuberances overgrown with coarse hairs.
They dwell in a vast underground city beneath the Enchanted Wood, where the doorways stand thirty feet high among Cyclopean round towers. The Gugs once reared stone circles in that wood and made strange sacrifices to the Other Gods and the crawling chaos Nyarlathotep, until one night an abomination of theirs reached the ears of earth's gods and they were banished to the caverns below. A central tower bearing the sign of Koth holds a great flight of stone steps and a trap-door leading up to the Enchanted Wood of the upper dreamland.
The Gugs wage endless war on the venomous ghasts in the vaults of Zin. In "The Dream-Quest of Unknown Kadath," Randolph Carter, aided by friendly ghouls including his friend the painter Richard Pickman, sneaks through the terrible city of the man-eating Gugs to make his way back to the surface.